drivers/mmc/host/sdhci-pltfm.c

   1 /*
   2  * sdhci-pltfm.c Support for SDHCI platform devices
   3  * Copyright (c) 2009 Intel Corporation
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 /* Supports:
  20  * SDHCI platform devices
  21  *
  22  * Inspired by sdhci-pci.c, by Pierre Ossman
  23  */
  24
  25 #include <linux/delay.h>
  26 #include <linux/highmem.h>
  27 #include <linux/mod_devicetable.h>
  28 #include <linux/platform_device.h>
  29
  30 #include <linux/mmc/host.h>
  31
  32 #include <linux/io.h>
  33 #include <linux/mmc/sdhci-pltfm.h>
  34
  35 #include "sdhci.h"
  36 #include "sdhci-pltfm.h"
  37
  38 /*****************************************************************************\
  39  *                                                                           *
  40  * SDHCI core callbacks                                                      *
  41  *                                                                           *
  42 \*****************************************************************************/
  43
  44 static struct sdhci_ops sdhci_pltfm_ops = {
  45 };
  46
  47 /*****************************************************************************\
  48  *                                                                           *
  49  * Device probing/removal                                                    *
  50  *                                                                           *
  51 \*****************************************************************************/
  52
  53 static int __devinit sdhci_pltfm_probe(struct platform_device *pdev)
  54 {
  55         const struct platform_device_id *platid = platform_get_device_id(pdev);
  56         struct sdhci_pltfm_data *pdata;
  57         struct sdhci_host *host;
  58         struct sdhci_pltfm_host *pltfm_host;
  59         struct resource *iomem;
  60         int ret;
  61
  62         if (platid && platid->driver_data)
  63                 pdata = (void *)platid->driver_data;
  64         else
  65                 pdata = pdev->dev.platform_data;
  66
  67         iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  68         if (!iomem) {
  69                 ret = -ENOMEM;
  70                 goto err;
  71         }
  72
  73         if (resource_size(iomem) < 0x100)
  74                 dev_err(&pdev->dev, "Invalid iomem size. You may "
  75                         "experience problems.\n");
  76
  77         /* Some PCI-based MFD need the parent here */
  78         if (pdev->dev.parent != &platform_bus)
  79                 host = sdhci_alloc_host(pdev->dev.parent, sizeof(*pltfm_host));
  80         else
  81                 host = sdhci_alloc_host(&pdev->dev, sizeof(*pltfm_host));
  82
  83         if (IS_ERR(host)) {
  84                 ret = PTR_ERR(host);
  85                 goto err;
  86         }
  87
  88         pltfm_host = sdhci_priv(host);
  89
  90         host->hw_name = "platform";
  91         if (pdata && pdata->ops)
  92                 host->ops = pdata->ops;
  93         else
  94                 host->ops = &sdhci_pltfm_ops;
  95         if (pdata)
  96                 host->quirks = pdata->quirks;
  97         host->irq = platform_get_irq(pdev, 0);
  98
  99         if (!request_mem_region(iomem->start, resource_size(iomem),
 100                 mmc_hostname(host->mmc))) {
 101                 dev_err(&pdev->dev, "cannot request region\n");
 102                 ret = -EBUSY;
 103                 goto err_request;
 104         }
 105
 106         host->ioaddr = ioremap(iomem->start, resource_size(iomem));
 107         if (!host->ioaddr) {
 108                 dev_err(&pdev->dev, "failed to remap registers\n");
 109                 ret = -ENOMEM;
 110                 goto err_remap;
 111         }
 112
 113         if (pdata && pdata->init) {
 114                 ret = pdata->init(host, pdata);
 115                 if (ret)
 116                         goto err_plat_init;
 117         }
 118
 119         ret = sdhci_add_host(host);
 120         if (ret)
 121                 goto err_add_host;
 122
 123         platform_set_drvdata(pdev, host);
 124
 125         return 0;
 126
 127 err_add_host:
 128         if (pdata && pdata->exit)
 129                 pdata->exit(host);
 130 err_plat_init:
 131         iounmap(host->ioaddr);
 132 err_remap:
 133         release_mem_region(iomem->start, resource_size(iomem));
 134 err_request:
 135         sdhci_free_host(host);
 136 err:
 137         printk(KERN_ERR"Probing of sdhci-pltfm failed: %d\n", ret);
 138         return ret;
 139 }
 140
 141 static int __devexit sdhci_pltfm_remove(struct platform_device *pdev)
 142 {
 143         struct sdhci_pltfm_data *pdata = pdev->dev.platform_data;
 144         struct sdhci_host *host = platform_get_drvdata(pdev);
 145         struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 146         int dead;
 147         u32 scratch;
 148
 149         dead = 0;
 150         scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
 151         if (scratch == (u32)-1)
 152                 dead = 1;
 153
 154         sdhci_remove_host(host, dead);
 155         if (pdata && pdata->exit)
 156                 pdata->exit(host);
 157         iounmap(host->ioaddr);
 158         release_mem_region(iomem->start, resource_size(iomem));
 159         sdhci_free_host(host);
 160         platform_set_drvdata(pdev, NULL);
 161
 162         return 0;
 163 }
 164
 165 static const struct platform_device_id sdhci_pltfm_ids[] = {
 166         { "sdhci", },
 167 #ifdef CONFIG_MMC_SDHCI_CNS3XXX
 168         { "sdhci-cns3xxx", (kernel_ulong_t)&sdhci_cns3xxx_pdata },
 169 #endif
 170 #ifdef CONFIG_MMC_SDHCI_ESDHC_IMX
 171         { "sdhci-esdhc-imx", (kernel_ulong_t)&sdhci_esdhc_imx_pdata },
 172 #endif
 173         { },
 174 };
 175 MODULE_DEVICE_TABLE(platform, sdhci_pltfm_ids);
 176
 177 #ifdef CONFIG_PM
 178 static int sdhci_pltfm_suspend(struct platform_device *dev, pm_message_t state)
 179 {
 180         struct sdhci_host *host = platform_get_drvdata(dev);
 181
 182         return sdhci_suspend_host(host, state);
 183 }
 184
 185 static int sdhci_pltfm_resume(struct platform_device *dev)
 186 {
 187         struct sdhci_host *host = platform_get_drvdata(dev);
 188
 189         return sdhci_resume_host(host);
 190 }
 191 #else
 192 #define sdhci_pltfm_suspend     NULL
 193 #define sdhci_pltfm_resume      NULL
 194 #endif  /* CONFIG_PM */
 195
 196 static struct platform_driver sdhci_pltfm_driver = {
 197         .driver = {
 198                 .name   = "sdhci",
 199                 .owner  = THIS_MODULE,
 200         },
 201         .probe          = sdhci_pltfm_probe,
 202         .remove         = __devexit_p(sdhci_pltfm_remove),
 203         .id_table       = sdhci_pltfm_ids,
 204         .suspend        = sdhci_pltfm_suspend,
 205         .resume         = sdhci_pltfm_resume,
 206 };
 207
 208 /*****************************************************************************\
 209  *                                                                           *
 210  * Driver init/exit                                                          *
 211  *                                                                           *
 212 \*****************************************************************************/
 213
 214 static int __init sdhci_drv_init(void)
 215 {
 216         return platform_driver_register(&sdhci_pltfm_driver);
 217 }
 218
 219 static void __exit sdhci_drv_exit(void)
 220 {
 221         platform_driver_unregister(&sdhci_pltfm_driver);
 222 }
 223
 224 module_init(sdhci_drv_init);
 225 module_exit(sdhci_drv_exit);
 226
 227 MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
 228 MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
 229 MODULE_LICENSE("GPL v2");